What Do Home Inspectors Look For? A Buyer’s Guide to the Checklist, Red Flags, and Limits

Home inspectors look at the roof and its drainage, the foundation and visible structural framing, the exterior walls and site grading, the plumbing system, the electrical systems, the heating and cooling systems, the attic, insulation and ventilation, the interior rooms of the house, and any visible safety issues. Everything on that list is checked by looking, operating normal controls, and documenting what is unsafe, significantly deficient, not working properly, or nearing the end of its service life. Most inspections turn up something: industry estimates put the share of inspections finding at least one issue needing attention at around 86%.

If you’re a buyer under contract, this is the last practical chance in the home buying process to learn what you’re buying before closing. If you’re a seller, it’s a preview of what a stranger with a flashlight will write down about your house. Either way, three priorities drive nearly every finding: safety, water, and the condition of the major systems.

What Is a Home Inspection, and What Does a Home Inspection Consist Of?

A home inspection is a noninvasive, visual examination of the readily accessible parts of a house. The inspector operates installed systems using their normal controls, observes visible conditions, and reports components that are unsafe, significantly deficient, not functioning properly, or approaching the end of their service life. That’s the scope defined by professional standards of practice such as those published by ASHI and InterNACHI.

A house does not pass or fail a conventional inspection. There’s no score. The inspection process also varies by state law and by the inspection agreement you sign, so read it. And “certified” and “licensed” are not interchangeable words. Some states license home inspectors, some don’t, and the title of certified home inspector comes from private associations rather than from any government body. Verify that you’re hiring a licensed inspector with your state licensing authority before you book.

Home Inspection vs. Home Appraisal vs. Code Inspection

The Consumer Financial Protection Bureau draws the same line: condition versus value. Confusing the two is the single most common mistake potential buyers make when reading their paperwork.

How Much Does a Home Inspection Cost, and Why the Buyer Pays?

Nationally, a home inspection averages roughly $340, with typical pricing running about $280 to $401 depending on where you live. Size, age, and location move the number, and a thorough home inspection of a large older house simply takes longer than a walkthrough of a small new one. Buyers almost always pay the inspector directly at the time of service rather than folding the fee into closing costs, and that matters: because the buyer pays, the inspector is accountable to you, not to the seller or the lender. The CFPB specifically recommends choosing your own.

Additional services are priced separately. Radon testing, a sewer scope, and a wood-destroying organism inspection each carry their own fee. A real estate agent may hand a first-time home buyer a list of names, which is fine as a starting point, but verify licensing yourself and ask for a sample report before you book.

The Three Risks Home Inspectors Prioritize

An inspector isn’t grading your paint finish. The question of what do home inspectors look for has a short answer: anything unsafe, anything wet, and anything expensive that’s close to failing. Nearly every observation in the report is an attempt to answer one of three questions about the house.

Can Water Get Into the House, or Stay In It?

Water is the most expensive slow problem in residential construction, and the serious problems it causes are usually well underway before anyone notices a stain. In the 2023 American Housing Survey, 11.8 million occupied units reported water leakage from outside and 11.2 million reported leakage from inside. That’s why a short downspout, a failed caulk joint, or soil sloping toward the house gets written up even when nothing looks wet on inspection day.

Could Anything Injure an Occupant or Start a Fire?

Electrical problems are among the leading causes of U.S. home fires, and the same housing survey counted 3.7 million units with exposed wiring. Safety hazards outrank everything else in the report regardless of repair cost. A $12 missing panel cover can matter more than a $9,000 roof.

Are the Structure and Major Systems Performing Today?

“Works right now” and “will keep working” are different claims. Home inspectors report what functions on inspection day and flag components near the end of their service life so you can budget. An 18-year-old furnace that fires up fine is still an 18-year-old furnace. Structural problems also show up at scale: 4.9 million units reported crumbling foundations, open cracks, or holes.

The Home Inspection Checklist: What Do Home Inspectors Look For, System by System

Here’s what a standard inspection covers, and where the boundaries sit. Use the inspection checklist below as a way to follow along on site. One rule applies throughout: standards require a representative number of like components, not every window, outlet, or cabinet in the house. Most inspections sample.

Exterior Walls, Grading, Drainage, Decks, and Trim

The exterior review includes wall coverings, flashing, trim, doors, eaves, soffits and fascia, decks, porches, balconies, steps, guards and railings, retaining walls, adjacent walkways, vegetation, grading, and surface drainage where any of it could affect the building. Cracked or uneven surfaces on walkways and steps get noted as trip hazards.

What inspectors look for out here is the set of routes water can take to the structure. Soil pitched back toward the house. Downspouts that dump two feet from the foundation. Failed flashing above a window. Shrubs holding moisture against siding. A deck ledger bolted through siding without flashing behind it. Gutter and drainage issues are one of the most common causes of water damage near foundations, and they’re cheap to fix compared to what they cause.

Peeling paint on its own is often cosmetic. Peeling paint over soft, punky trim you can push a screwdriver into is not. The distinction between a coating problem and substrate deterioration is one worth understanding before you accept any repair proposal.

Do Home Inspectors Check the Roof, Flashing, and Gutters?

Yes. The roof review typically covers covering materials, flashing, gutters and downspouts, skylights, chimneys, plumbing vents and other penetrations, the visible roof structure from accessible attic areas, and evidence of active or previous leakage. Missing or lifted shingles, granule loss, failed pipe boots, and staining on attic sheathing all get documented. Roof damage is among the most commonly flagged findings in inspection reports.

But a general inspector may examine the roof from the ground, the eaves, a ladder, a drone, or another safe vantage point. Under common standards of practice, home inspectors are not required to walk a roof, remove snow or debris, perform water testing, certify the installation, or predict how many years are left in the covering. A steep, wet, or high roof often means a limited view, and a limited view is itself a finding.

When access is restricted or the report identifies active leakage, damaged flashing, or widespread covering failure, a roof-specific evaluation is the right next step. Hayward and Bay Area readers can review the inspection and repair scope described by Symplify Roofing as one example of what a roofing evaluation includes before comparing written proposals from several contractors.

Foundation and Visible Structural Components

Home inspectors examine accessible foundation walls and visible framing in basements, crawl spaces, and attics, plus floors, walls, ceilings, and the roof structure. Inspectors look for cracks, displacement, sagging, damaged or altered framing, sticking doors, and sloped floors that hint at movement below.

Hairline settlement cracks in concrete are common in most housing stock and are not automatically a deal breaker. Cracks wider than roughly a quarter inch, cracks with displacement across the face, or framing that’s been cut or notched by a previous owner suggest structural issues worth a second opinion. Inspectors don’t calculate structural loads, assess soil stability, or issue engineering opinions. Real movement calls for a structural engineer.

Plumbing System, Water Pressure, and the Water Heater

Coverage generally includes visible supply piping, drains, waste and vents, fixtures and faucets, toilets, water-heating equipment, sump pumps, sewage ejectors, and accessible fuel-distribution components. Findings often include active leaks, corrosion at connections, poor functional flow when two fixtures run at once, loose toilets, slow drainage, and unsafe water heater installation or venting. Corroded or outdated piping is a frequent flag, and plumbing problems commonly cost somewhere between $1,000 and $5,000 to correct.

Exclusions are significant. Buried sewer lines, septic systems, wells, water quality, concealed piping inside walls, and irrigation systems fall outside the standard scope. A sewer scope is a separate service, and on any older house with mature trees near the line, it’s usually money well spent.

Electrical Systems: What Inspectors Look For in the Electrical Panel, Wiring, and Outlets

The review of the electrical systems covers the service entrance and main disconnect, the main electrical panel and accessible subpanels, circuit breakers or fuses, grounding and bonding, visible conductors and wiring methods, a representative number of switches, lights and receptacles, accessible GFCI and AFCI devices, and the presence of smoke and carbon monoxide alarms.

Typical findings: exposed wiring, evidence of overheating or arcing at terminations, missing panel covers, open slots in a panel, reversed polarity, ungrounded three-prong receptacles, damaged insulation, and amateur splices outside a junction box. Are the outlets grounded, and is the GFCI protection near sinks, tubs, and exterior receptacles working correctly? Missing GFCI protection is one of the most common write-ups in the whole report. Branch-circuit aluminum wiring in houses built in the mid to late 1960s and early 1970s also gets flagged for evaluation by an electrician. Note that an inspector may report that alarms are present without testing every single device.

Heating and Cooling Systems, Fireplaces, and Venting

The inspector runs the HVAC system using normal controls when weather permits, then reviews accessible equipment, distribution ductwork or piping, vents, flues, and chimneys, along with accessible fireplaces and inserts. Heating and cooling systems get tested in whatever mode the outdoor temperature allows, and an inspector may decline to run an air conditioner in cold weather because doing so can damage the compressor. Aging furnaces and air conditioners tend to produce findings, and full replacement of an HVAC system averages in the neighborhood of $7,500, so the equipment’s age is worth asking about.

Limits are real here. A standard inspection doesn’t determine whether equipment is correctly sized, doesn’t test room-by-room temperature balance, and can’t confirm whether a furnace heat exchanger is internally sound. Nobody scans the inside of your flue. Combustion concerns go to an HVAC technician or a chimney specialist. Geothermal and solar equipment may sit outside the base scope entirely.

Attic, Insulation, Ventilation, and Crawl Spaces

Home inspectors review visible insulation and vapor retarders in unfinished spaces, attic and foundation ventilation, and the termination of kitchen, bath, laundry, and dryer exhaust. These are the spaces where hidden problems tend to collect, so they get careful attention. Common findings include disturbed or missing insulation, soffit vents blocked by blown-in material, bath fans dumping into the attic instead of outside, condensation on sheathing, staining, and rot. Moisture in attics and crawl spaces matters: 3.9 million occupied units reported mold in the 2023 survey. Inspectors generally do not move insulation or dismantle finishes to look underneath.

Interior Rooms, Windows, Doors, Stairs, and Appliances

Interior coverage includes walls, ceilings, floors, stairways, handrails and guards, a representative number of doors and windows, installed cabinets, garage doors and the auto-reverse safety feature, and selected permanently installed appliances such as a range or dishwasher. Doors and windows that don’t close properly sometimes point to framing movement rather than a hinge problem. Appliance scope varies more than buyers expect. Refrigerators, clothes washers, dryers, and specialty functions are often excluded. Minor issues like a sticking window or a loose cabinet door belong in the report, but they belong at the bottom of your priority list.

Signs of Pests and Wood-Destroying Organisms

A general inspector may note visible evidence: mud tubes on foundation walls, frass, wood that sounds hollow when tapped, rodent droppings in the crawl space, or wood-to-soil contact that invites termites. Damage rarely sits in plain sight, which is part of why the observation is a recommendation and not a diagnosis. A formal termite or WDO inspection is a separate service performed by a licensed pest professional, and in parts of the South and Southwest, lenders require one.

What Do Home Inspectors Not Check?

Standard inspections generally exclude:

• Radon testing, mold sampling, lead-paint testing, and asbestos identification
• Termite and wood-destroying organism inspections
• Sewer scopes, septic systems, wells, and water quality
• Swimming pools, spas, underground tanks, and buried utilities
• Solar and other specialized energy systems
• Concealed defects behind walls or under flooring
• Building code compliance and repair cost estimates
• Property boundaries, easements, and surveys

A few of these deserve emphasis. EPA recommends testing every house for radon, notes that testing is the only way to know a home’s level, and estimates indoor radon contributes to roughly 21,000 U.S. lung cancer deaths a year. For homes built before 1978, federal rules require sellers to disclose known lead-paint information, and buyers generally get a 10-day window to conduct a lead inspection or risk assessment unless the contract changes it. With visible mold, EPA’s guidance is to identify and fix the moisture source; sampling is often unnecessary when growth is already visible, and there’s no federal safe level for spores. Separately, your insurer may want roof age or wiring details before binding home insurance, regardless of what the home inspection says.

What Are the Biggest Red Flags and Deal Breakers in a Home Inspection?

Ranked roughly by consequence:

• Active roof leakage or a failed covering. Water is already inside the house, and the damage compounds every storm.
• Foundation displacement or wide, offset cracks. Anything beyond about a quarter inch with movement needs an engineer, not an opinion.
• Unsafe panel, damaged, or amateur wiring. Electrical problems lead U.S. home fires.
• Ongoing water intrusion and rot. Often hidden and almost always worse than it looks from outside.
• Failed or end-of-life HVAC. Replacement runs around $7,500 on average.
• Sewer line problems. Excavation costs escalate fast.
• Suspected asbestos, lead, or elevated radon. Uncertainty is the expense here.

Two guardrails. Age alone is not a defect: a 30-year-old panel that’s intact and correctly wired is not a hazard because of its birthday. And cosmetic flaws are not deal breakers. What actually kills a deal depends on your budget and your contract, not on anything the inspector writes.

Should Buyers Attend the Inspection? What Happens on Inspection Day

Attend if you can. Both NAR and CFPB guidance encourage it, and the reason is practical: standing in the crawl space while someone points at a stain teaches you more than reading about that stain three days later. Plan for two to four hours in a typical single-family house, longer for large, old, or add-on-heavy properties.

Access is the seller’s job: clear the electrical panel, attic hatch, crawl space entry, water heater, and garage, and leave the utilities on. As a buyer, follow the inspector, take photos, and ask one question repeatedly: how serious is this, and what does it lead to?

How to Read a Home Inspection Report and Ask for a Better Home Inspection Report

Don’t judge a report by its page count. With roughly 86% of inspections finding at least one issue needing attention, a long report usually means a thorough home inspection, not a broken house. Treat it as a prioritized to-do list rather than a verdict, and sort the inspection results by consequence:

1. Immediate safety issues
2. Active water intrusion or structural concerns
3. Major systems needing specialist evaluation or near-term capital spending
4. Routine maintenance
5. Cosmetic preferences and minor issues

A good home inspection report gives each finding a clear photo, a location reference, and a recommendation, and it separates serious issues from housekeeping. A weak one gives you a boilerplate sentence and a checkbox. That gap is exactly why you request a sample report before hiring.

What to Do After the Inspection: Specialists, Estimates, and Negotiating Repairs

Call the inspector and ask which findings they’d act on first. Then order specialist evaluations immediately, because they have to come back inside your inspection contingency window, not after it. That window is the one point in the home buying process where you can still walk away cleanly. Compare written scopes, not verbal ballpark numbers, since two contractors quoting wildly different prices are usually quoting different work.

For moisture findings, sequence matters: correct the leak, remove or repair deteriorated material, prepare the surface, then coat it. Painting over wet or rotted wood buys a season and costs you twice. Washington state homeowners can use https://coverpropainting.com/ as one example when comparing combined painting and rot-repair scopes, rather than accepting a paint-only proposal. Once you have real numbers for the needed repairs, you can negotiate repairs, a credit, a price adjustment, or cancellation rights under the terms your purchase agreement already spells out. Whether the seller pays for the work or you take a credit and hire your own contractor is a judgment call, and reopening the offer process late has its own risk. A real estate agent or attorney can tell you what’s customary in your market and help you settle on a path forward, but the call is yours.

Which Specialist Should You Call for Each Finding?

These are categories of professionals, not endorsements. Get more than one written scope in each category.

Should Sellers Get a Pre-Listing Inspection?

A pre-listing inspection lets a seller repair or price known major defects on their own timeline and cuts down on unpleasant surprises after an offer. Sellers expect buyers to focus on big-ticket items, and finding those first puts you in a better position to respond. The trade-off is disclosure: once you know about a defect, most states require you to tell potential buyers, whether or not you fix it. Use whatever the inspector finds to correct causes. Painting over a water stain without addressing the leak is the kind of thing an inspector notices and a buyer’s attorney remembers.

Frequently Asked Questions

What Do Home Inspectors Look For First on Inspection Day?

Conditions that can hurt someone or that are actively letting water into the house. Panel and wiring hazards, missing guards, gas and venting concerns, and evidence of leakage get priority, because those drive both cost and risk. Cosmetic notes come last no matter how many of them the report contains.

What Are the Biggest Red Flags in a Home Inspection?

Active water intrusion, structural movement, unsafe conditions in the electrical systems, a failed roof covering, and end-of-life HVAC equipment. These carry the highest combination of safety risk and cost, which is why they belong at the top of your triage list before anything cosmetic.

What Are the Most Common Home Inspection Fails?

The most frequently flagged items are roof damage, drainage and gutter problems, aging or outdated wiring, leaking or corroded plumbing, moisture in attics and crawl spaces, and missing GFCI protection near water sources. Most are correctable, and several are inexpensive relative to what they prevent.

What Is a Deal Breaker in a Home Inspection?

There’s no universal list. A deal breaker is any finding whose cost, safety risk, or uncertainty exceeds what you can absorb. In practice that usually means major structural movement, extensive hidden water damage, or a failed septic system or sewer line.

How Do You Pass a Home Inspection Checklist?

You can’t, because a conventional home inspection has no pass or fail result. Sellers can still prepare: leave utilities on, clear access to the panel, attic, and crawl space, fix known safety issues, correct drainage, replace burned-out bulbs and missing covers, and service the heating and cooling systems. Lender, insurance, or FHA and VA conditions can create separate repair requirements.

Do Home Inspectors Check for Mold, Termites, Radon, and Asbestos?

Generally no. Home inspectors may note visible evidence and recommend follow-up, but sampling and testing are separate services performed by certified professionals and cost extra. EPA advises testing every house for radon, and for visible mold, the priority is finding and fixing the moisture source rather than sampling the air.